1996 Eagle Talon Really Rough Idle

I just got done putting in a Crank sensor and a balance shaft belt in the car it was running perfect it had never ran so smooth before the car is a turbo car just so you guys know and I parked it and it was still running smooth and was at a friends for a few hours I got back into the car and it didnt want to start I had to give it some gas to get it to start and when it did start it idled really rough like down in the 300 rpm range and it sounds really bad almost like it is misfiring but I dont know how it would just randomly develop that problem from when I went into my friends until I came out so I am asking for your guys help to point me in the right directions please thanks